Frequency Domain Differential Modulation for Mini-Slot-Assisted Short Packet URLLC

In this paper, we investigate the adoption of frequency domain differential modulation to support mini-slot-assisted URLLC, which can eliminate the channel estimation burden and reduce the power and bandwidth overhead incurred in traditional coherent modulation schemes. Furthermore, we derive the block error rate (BLER) for frequency domain differential OFDM (FDDi-OFDM) using non-asymptotic information-theoretic bounds. Simulation results verify the accuracy of the analysis and show that, for a high Doppler environment, FDDi-OFDM can yield a much better result than the pilot-assisted coherent scheme.